[coro_http][feat]replace resp body int with int64 (#981) #1935

Job	Run time
ubuntu_clang_pb (Debug, OFF, ON)	3m 44s
ubuntu_clang_for_liburing (Release, OFF, ON)	7m 25s
ubuntu_clang10 (Debug)	11m 30s
ubuntu_clang_for_liburing (Debug, OFF, ON)	6m 13s
ubuntu_clang (Release, OFF, ON)	11m 35s
ubuntu_clang_pb (Release, OFF, OFF)	4m 15s
ubuntu_clang (Debug, OFF, ON)	9m 45s
ubuntu_clang (Debug, OFF, OFF)	9m 2s
ubuntu_clang_pb (Release, OFF, ON)	4m 32s
ubuntu_clang10 (Release)	1s
ubuntu_clang (Release, OFF, OFF)	10m 48s
ubuntu_clang_pb (Debug, OFF, OFF)	3m 32s
	1h 22m 22s

Provide feedback